Telephone-receiver.



H. U. EGERTON.

TELEPHONE RECEIVER,

APPLICATION FILED 001'. 5, 1912.

Patented Jan. 12, 1915.

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n W m A V W W 3 m5 .m W 5 mm w HENRY C. EGERTON, OF PASSAIC, NEW JERSEY, ASSIGNOB T0 WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented Jan. 12,1915.

Application filed October 5, 1912. Serial No. 724,057.

This invention relates to telephonic re-' ceiving apparatus and more particularly to a telephonic receiving device of the type used for announcing and like purposes and commonly known as a load speaking re ceiver. i

The object of this invention is to provide a new and improved device of this type of few and simple parts, rigid construction and improved operation.

Features of the invention are the means provided for mounting the sound box, the

means provided for obtaining the adjustment of the magnetic parts, the means by which the armature of the electromagnet is maintained in position without the use of retaining springs or screws and other details of structure as will hereinafter more fully appear.

In the drawings illustrating this inventionFigure 1 is a longitudinal sectional View taken upon line 11 of Fig. 2; Fig. 2 is a view in front elevation with parts removed of a receiver embodying this invention; Fig. 3 is a detail perspective View of the armature and lever arm of the improved structure; Fig. 4 is a detail perspective view of the magnet coils and mounting and Fig. 5 is a detail sectional View taken upon line 5-5 of Fig. 2.

As shown in the drawings, 5 and 6 designate two members of a metal casing, the

member 5 being formed integrally with a base or mounting portion 7 and the member 6 beingformed separately and secured to the member 5 by means of machine screws engaging lugs 8, 8 on said member 5.

Attached to the casing member 6 is a double horseshoe magnet comprising arms 9, 10, 11 and 12 all-connected to a common yoke 13. The bars 9 and 10 are of the same polarity as are also the bars 11 and 12, the latter two being of opposite polarity to the former two, the bars 9 and 11 being in one path of a com lete magnetic circuit and the bars 10 and 12 being in a separate path of a complete magnetic circuit. Extending between the bars 9 and 11 and secured to the mner face thereof is a block 15 of brass or other non-magnetic material having a ridge 16 formed thereon and being cut away or recessed at its central longitudinal portion as shown at 17, 17 in F 4:. The block 15 is rigidly secured to the bars 9 and 10 by means of machine screws 18, 18 ex-- tending through said bars and engaging screw-threaded openings in said block 15. The ridge 16 of said block is rounded on its upper surface and provided at its central portion with a notch 19, the purpose of WhlCh will hereinafter more fully appear.

lnterposed between the lower face of the block 15 and the adjacent faces of the bars 9 and 10 is a strip 20 of magnetic material preferably Norway iron which is secured to said block 15 by means of machine screws 21, 21. The strip 20 is provided with upturned portions 22, 22 constituting cores or poles for magnet spools 23, 23 mounted thereon adjacent to the recessed portions of the brass block 15. Extending through the strip 20 at its central portion is a screw 25 which abuts at its inner end against the block 15 and is provided with a locking nut 26. The purpose of this screw isto obtain the ad ustment of the magnetic parts as will Fhereinafter appear.

The magnets 23, 23 control the movement of an armature 30 ca a lever arm 31, one end of which is attached to said armature, the other end being attached to a diaphragm 32 mounted in a sound box 33. As shown the armature 30 rests upon the ridge 16 of the brass block 15 with its opposite ends in juxtaposition to the cores or poles 22, 22 of the strip 20 and is provided On its under face with a projection 35 which engages in the opening or notch 19 of the ridge 16 to prevent the movement of said armature longitudinally of said block. Thepoles 22, 22 are normally ground off so that they will come even with the top of the ridge'lfi when the strip 20 is flat against the block 15 and the poles are adjusted simultaneously with respect to the armature by the turning of vthe screw 25. The armature 30 having one face toward poles 9 and 10 of like polarity and its other face toward poles 11 and 12 also of like polarity but of opposite polarity to the poles and 10 will be reserted between the diaphragm and the walls- .of the sound box 33. Extending through the 10 member 40 of the sound box 33 and attached thereto is a tubular member 45. This tubu-' lar member which is screw threaded throughout its length extends between the bars 9 and 10 of the permanent magnet and 15 through an opening in the casing member 6 to receive a supporting member 46 of a horn 47. Upon opposite sides/of the bars 9 and 10 of the magnet are mounted nuts and washers 48, 48 and 49, 49 by means'of which the tubular member 45 is clamped rigidly upon the permanent magnet. A clamping nut 50 and washer 51 are mounted upon said tubular member 45 adjacentthe outer ,face of the casing member 6. A tubular 25 member 55 similar to 45 is secured to the member 41 of the sound box 33 and extends outwardly between the bars 11 and 12 and through an opening in the casing member 5. The opening through which the tubular member 55 passes is provided with a screwthreaded bushing 56 and a clamping nut and washers 57 and 58 are provided for securing said tubular member 55 with the casing member 5. A supporting member 59 carrying a horn 60 ismounted upon the outer end of the tubular member v55. member 55 is provided with an opening 61 through which the arm 31 extends into engagement with the diaphragm 32.

Terminal clips 65, 65 are mounted upon the casing member 6. The casing member 6 is also provided with a groove 66 containing a felt ring 67 against which the margin of the casing member 5 bears when the casing 45 is assembled. a

By forming the permanent magnet with four arms and mounting the energizing windings and sound box between these arms there is obtained a compact structure easily manufactured at a reasonable cost and one which is eflicient in its operationand which may be subjected to rough usage and sudden jars without affecting the adjustment of the parts. By the use of flat top pole pieces set close together with a flat armature pivotally supported between them the arm connected with the diaphragm can be given sufficient movement with but slight movement of the armature, thus enabling the structure to 50 work with the minimum air gap between the armature and pole pieces. The magnetic path is further improved by the use of the integral core piece and the single adjusting screw for varying the relation of the cores to 65 the armature, thus providing a magnetic The tubular path of minimum reluctance. The elimination of springs and screws for retaining the armature in its operative relation to the poles of the energizing magnet is also of considerable advantage since it eliminates the weight and friction necessarily attendant upon the use of these parts and also simplifies the structure and the cost of production.

I claim: 1. In a telephone receiver, a permanent magnet embracing a plurality of arms, mag-.

netic cores supported upon arms of like polarity, energizing windings for said cores, an armature located between the arms of said permanent magnet and maintained in operative position with respect to said cores by the magnetism of said permanent magnet find a diaphragm connected with said armaure.

2. In a telephone receiver, a permanent magnet comprising a plurality of arms, energizing windings, a diaphragm controlledby said energizing windings, a sound box for said diaphragm, a tubular member rigidly attached to and opening into said sound box and means for adj ustably securing said tubular member to arms of said permanent magnet.

3. In a telephone receiver, a permanent magnet comprising a plurality of arms, a supporting block of non-magnetic material extending between arms of said permanent.

magnet of like polarity, cores of magnetic material carriedby said supporting block, energizing windings carried by said cores, an armature pivotally supported upon said supporting block in operative relation to said cores, a diaphragm operatively connected with said armature and means for adjusting said cores simultaneously with respect to said armature.

4. In a telephone receiver, a permanent magnet comprising a plurality of arms, a supporting block of non-magnetic material extending between arms of said permanent magnet of like polarity, a strip of magnetic material secured to said block, cores formed integrally with said strip, energizing windings carried by said cores, an armature piv'-' otally supported upon said supporting block in operative relation to said cores, a diaphragm operatively connected withsaid armature and means for springing said magnetic strip with respect to said supporting block whereby the relation of said-cores and said armature may be varied.

5. In a telephone receiver, a permanent magnet comprising a plurality of arms, a

supporting block of non-magnetic materialv said supporting block in operative relation to said cores, a diaphragm operatively con- ;nected with said armature and an adjusting screw extending through said magnetic strip and engaging a face of said supporting block. I

3 6. In a telephone receiver, a permanent magnet embracing a plurality of arms, a supporting block of non-magnetic material mounted upon arms of said permanent magnet, magnetizing cores carried by said block, energizing windings mounted upon said c'ores, a ridge portion extending longitudinally of said supporting block between said cores, a flat armature pivotallysupported by said ridge in operative relation to said cores, means for preventing the movement of said armature longitudinally of said supporting block and a diaphragm operatively connected with said armature.

7. In a telephone receiver, a permanent magnet .embraclng a plurality of arms, a

porting block between said cores, said ridge being provided midway of its ends with a notch, an armature resting upon said ridge upon opposite sides of said notch, a projecting member attached to said armature and engaging said notch and a diaphragm oper-y atively connected with said armature. 8. In a telephone receiver, a permanent magnet comprising a plurality of arms, magnetic cores supported between arms of said permanent magnet, energizing windings on said cores, an armature pivotally supported in operative relation'to said cores, a diaphragm operatively connected with said armature, a sound box for said diaphragm, a casing for said permanent magnet, and sound conducting means supporting said sound box between arms of said permanent magnet and supporting said permanent magnet in said casing.

9. In a telephone receiver, a permanent magnet comprising a plurality of parallel arms, magnetic cores supported by arms of said permanent magnet, energizing windings for said cores, an armature pivotally supported in operative relation to said cores, a diaphragm operatively connected with said armature, a sound box for said diaphragm located between thearms of said permanent magnet, acasing for said permanent magnet having an opening through one side thereof, a tubular member attached to said sound box extending between arms of said permanent magnet and through said opening in said casing, means carried by said tubular member for adjustably securing it to arms of said permanent magnet, means also carried by said tubular member for securing it in said casing and horn attaching means car ried by the outer end of said tubular member.

In witness whereof, I hereunto subscribe my name-this third day of October A. D., 1912.

Grno. WILLIS Pianos,- Josnrn A. GATELY. 

